package java.com.it.reggie.filter;
//过滤器

import com.alibaba.fastjson.JSON;
import com.it.reggie.common.BaseContext;
import com.it.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已经完成登录
 */
@Slf4j
@WebFilter(filterName = "LogCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，专门用于路径比较，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest,
                         ServletResponse servletResponse,
                         FilterChain filterChain)
            throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        log.info("拦截到请求: {}", request.getRequestURI());//获取请求日志
        //1.获取本次请求的URL
        String requestURI = request.getRequestURI();
        log.info("拦截到请求: {}", requestURI);//获取请求日志
        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",//移动端发送短信
                "/user/login"//移动端登录
        };
        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //3.如果不需要处理，直接放行
        if (check == true) {
            log.info("本次请求不需要拦截处理: {}", requestURI);
            filterChain.doFilter(request, response);
            return;
        }
        //4-1.判断员工登录状态，如果已登录，则直接放行（程序端）
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，用户id为: {}", request.getSession().getAttribute("employee"));
            //获得线程id
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request, response);
            return;
        }
        //4-2.判断用户登录状态，如果已登录，则直接放行（移动端）
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为: {}", request.getSession().getAttribute("user"));
            //获得线程id
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request, response);
            return;
        }
        //5.如果未登录则返会未登录结果,通过输出流方式向客户端页面响应数据
        log.info("用户未登录: {}", requestURI);
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     *
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match == true) {
                return true;
            }
        }
        return false;
    }
}
